Six Seattle-area men have been indicted on firearms charges following an undercover investigation targeting gun traffickers in the region.

Federal agents claim to have seized 25 guns during the investigation, which saw four convicted felons and two other men arrested earlier this week on allegations that they were illegally dealing or possessing guns.

Federal prosecutors in Seattle contend the weapons were sold to an informant over several months earlier this year. Five of the defendants are charged with conspiracy to unlawfully deal firearms, and unlawfully dealing in firearms.

“The defendants trafficked all kinds of firearms, including semi-automatic assault rifles, sawed-off shotguns, handguns and even a silencer,” U.S. Attorney Jenny A. Durkan said in a statement. “Convicted felons illegally selling this kind of firepower is a dangerous combination.”

Those indicted were Seattle residents Andre M. Conerly, 25; Joshua Dawson, 20; James L. Henderson, 22; Daunte R. Williams, 29; and Alexander J. Olivio-Altheimer, 21, as well as Federal Way resident Djuan O. Gardner, 28. All are expected to appear Wednesday afternoon in U.S. District Court at Seattle.

Prosecutors contend all the men except Gardner conspired to deal guns illegally, and eventually sold weapons to the government informant. According to court documents, one of the guns sold by Dawson on Jan. 31 had been used to shoot three people in Seattle's South Lake Union neighborhood three days prior to its sale.

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According to the indictment unsealed Wednesday, the five Seattle men acquired weapons from an unknown source and sold them to whoever would buy them.

In January and February, Conerly and others are alleged to have sold the informant several high-power weapons – three SKS-style rifles, and a semi-automatic AK-47 variant – as well as pistols and a shotgun.

Following the initial sales, Conerly, Williams and Henderson arranged to sell the informant four more rifles, including one equipped with a silencer, prosecutors contend in the indictment.

Conerly and Dawson are alleged to have delivered an AR-15-style rifle with a silencer attached, as well as another AR-15. Prosecutors contend Conerly also delivered two more AR-15-style rifles, while Olivio-Altheimer is alleged to have delivered three other assault rifles, as well as several shotguns.

Gardner, a drug offender previously caught with guns at least twice, is alleged to have been caught with an SKS-style rifle and pistol. Prosecutors don't contend he was dealing weapons.

The indictment followed a long-running undercover investigation by the Seattle Police gang unit, the FBI and the Bureau of Alcohol, Tobacco, Firearms & Explosives.

“The detectives on this investigation worked tirelessly over months to build a case that resulted in the removal of dangerous weapons off our streets and the arrests of those responsible,” Seattle Police Chief John Diaz said in a statement.

Olivio-Altheimer has also been charged with possessing a sawed-off shotgun, while Conerly, whose criminal history includes three convictions for felony theft, is alleged to have been caught with an unregistered silencer and a sawed-off shotgun without a registration stamp.